Over time, Theseus replaces parts of his ship. Eventually, he has replaced all of the parts. Is it still Thesus's ship?

In addition, what if you gathered the discarded parts from Theseus's ship and eventually used them to build a second ship? Would _that_ be Theseus's ship?

The paradox of the heap is an example of this paradox which arises when one considers a heap of sand, from which grains are individually removed. Is it still a heap when only one grain remains? If not, when did it change from a heap to a non-heap?

"It is p, but I don't believe it is p."